Bobbin-winding mechanism for sewing-machines



I. A. FLANAGAN. BOBBIN WINDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED FEB- 4, 1920- RENEWED JUNE 1.1921- Patented Aug. 9,1921.

2 SHEETS-SHEET I.

Inve nfor J. A. FLANAGAN. BOBBIN wmmm; MECHANISM FOR SEWING MACHINES"APPLICATION FILED FEB. 4. 1920. RENEWED JUNE 11 1921.

' Patented Aug. 9, 1921,

2 SHEETS-SHEET 2- jhl enfor.

' will press againstiit,and gradually move it- J MEs-ALEXA DERFLANAGAMOF rononiro, onTArtio, cAimnA.

Bo 'Bm-w'mnme Mac-Himalayan swims-Machines.

Application filed February-4, 1920, seriaino. 356,202. Renewed Jufi'e1,1921, seriaim. 474,300.

To all whom it may concern:

Be it known that I, JAMES AhEXANDER FLANAGAN, a British subject,residing at the city. of Toronto, in the county of York and Province ofOntario, Dominion ofCanada, have invented certain. new and usefulImprovements in Bobbin-Vvinding Mechanism for Sewing-Machines, and-Ihereby declare the following. to be a full, clear, and exact descriptionof the same.

Mypresent invention-relates to a bobbin winding attachmentforswingflmachines in: which the bobbin spindle is, mounted in a,

spring-pressed rocker arm, adapted tooscillate between an operative andan inopera-.

tiv'e position; the object of the invention being to provide thisattachment with a peas the winding proceeds to disengage the latch fromthe arm and thereby enable it and its'rel'ated parts toautomaticallymove from the operative to the inoperative position.

In carrying out arm is hinged to a supporting member or stationarybracket, preferably forming part of'or secured to the wheel; guard ortosome other stationarypart ofthe machine,and is I acted upon by av springwhich tends to move it and hold it in the inoperative position. A.

detent or latch is-pivoted to the stationary bracket toenga'ge therocker arm and. hold I it in the operative position against the tensionof the spring, and thisfdetent or latch is provided with 'a .castoffmember integrally formed .or rigidly connected with it, the

castoff member, being arranged inalinement' with the thread receivingportion of the bobbin, .so that the thread wound thereon asthewinding'proceeds to disengage the latch from the rocker arm. j .1

For an understanding of the invention Specification of emisr tent;Patented Au i 9,1921.

reference is to be had to' the following de sc'ription' and to theaccompanying drawings, in which:

Figure 1, is a Sldfl elevationa'l view of the' flywheel, wheel guard andthe bobbin winding" mechanism showing the detent or latch engaging therocker arm and holding the friction wheel in contact with the flywheel,

Fig.2, is a similar viewtoFig. 1, showing the position of the parts whenthe detent has'released the rocker arm,

Fig. 3, isa top plan View of the parts in the same position as shown inFig. 1,

Fig. 4, .is' a front elevation'al view ofthe parts in the same positionas in Fig.1,

Fig. 5, is a" detail view of the rocker arm, I

Fig. 6, is a detail view of the detent er latch, and

Fig. 7, is a detail View of the" su porting. member. I I Like charactersof reference refer to like parts throughout the specification and} drawme.

it represents theusual flywheel of the'sew ing. machine-mounted on theshaft b, and 0 represents the usual wheel. guard for the flywheeL- Atthe-side of the wheel gu'ard c is a supporting member which is shown iiiI the drawings to take the form of a bracket the invention the rockerorarm cl, inclined downwardly-forwardly beyond the wheel guard 0'.Thisbracket or arm d is. preferably secured tothewheel guard at by'twobolts 6-, e, thelower bolt e,

being the nearer one of the two to the pef Near the outer end of screwthreadedyshank of a stud i1 Encircling the stud i is the cylindrical huby' of detent'g herein-v the bracket or arm a (Z is a screw threaded holeIt, to receive the the rocker arm is, and'within the. hub j is a coiledspring Z, one end ofwlii'ch is anchored to the hub j, andthe other end mof which is extendedbeyond the coils and anchoredbetween two pins 0projecting from the adjacentside of the bracket or arm" d;

This arrangement enables the spring to press the rocker arm 70 in adirection outward from the flywheel, and move it to what may be termedits inoperative position.

At or near the free end of the rocker arm 70 are spaced bearings 79, p,and journaled in these bearings is the bobbin spindle g, on the outerend of which is fixed a friction wheel 9 to engage with the flywheel a.

Mounted on the bobbin spindle Q between the bearings 7), 7), is a worm1" of such proportions as to fill the space between these bearings andcontact their opposed faces. This worm rotates with the bobbin shaft 9and meshes with a worm wheel 8, journaled on a stud 75, secured to therocker arm is.

- On the worm wheel .9 is a cam M, which engages with. an arm 1) of thethread distributer w.-

At the junction of the thread distributer w and arm '4) is a lug 00, andpassing through the lug m is a stud 3 which enters a cylindrical lug .2,forming part of the rocker arm 70. Within the cylindrical lug z is acoiled spring a, one end of which is anchored within the cylindrical lugz, and the other end of which is anchored to the thread distributer to,so as to maintain the arm 11 continually in contact with the peripheryof the cam u.

During the revolution of the bobbin spindle g, the worm r meshing withthe teeth ofthe worm wheel 8, causes the revolution of the latter andthe cam m. This .cam is so timed as to gradually and slowly move thethread distributer 'w in a direction toward the flywheel, and then whenit has moved the distributer to its limit of motion in that direction topermit of the spring a graduallymoving the thread distributer to itslimit of motion in the opposite direction, the thread distributer thuspassing across the face of the bobbin 7) alternately in oppositedirections at each revolution of the cam to dis tribute the threadevenly across the face of the bobbin.

The bearing p is alined with the detent g and is provided with aflattenedsurface p to be engaged by the detent. The detent as shown inthe drawings overlies the top of the arm and is formed with a hookshape-d end 7, which engages with the flattened surface 39 and holds therocker arm in its operative position and maintains the friction wheel 9'wheel a; I

Extending from the hub f is a castofl arm 9, which overlies the threadreceiving part of the bobbin Z2 when the bobbin is mounted on the bobbinspindle as shown in the drawings, the free end of the arm g being curvedupwardly to provide a clearance for the thread distributer to, when theparts are in the positionshown in Figs. 1 and 4.

The detent g and the castofl' arm g are in contact with the flyin thesame transverse plane and the flattened surface 10 of the bearing p isof such height as to permit of the arm 9' entering between the flangesof the bobbin before the thread is wound thereon. As the bobbin fillsduring the winding operation the thread comes into contact with andpresses against the arm 9, and gradually moves it outward as the windingproceeds. This arm is preferably integral with the detent g and its hubf, and as the winding proceeds it unitedly lifts with it the detent g,the lifting continuing until the thread reaches the periphery of thebobbin flanges. I

At this point the arm .9 and the detent are raised sufliciently torelease the hook ment with the bearing 0. The spring Z then moves therocker arm forwardly to its inoperative position, and the friction wheelis then free from contact with the flywheel.

In its operative position the rocker arm is assumes a perpendicular orsubstantially perpendicular position with the friction wheel in contactwith the flywheel a, and the detent g lying loosely on the top of thebearing 39 and the hook shaped end f" engaging the flattened surface10'.

When the thread winding upon the bobbin raises the castoff arm 9 anddetent sufliciently to disengage the hook shaped end f" from the bearingp,the rocker arm,under the influence of the spring Z, turns on the studz and the friction wheel moves outwardly and forwardly from the flywheeluntil the forward movement of the rocker arm is arrested by the stop 0'on the hub j engaging with the spring Z.

A convenient method of forming this stop is to recess the cylindricalwall of the hub '7', as shown in Fig. 5, the recess being of sufficientlength to permit of the free movement of the hub during the rocking ofthe arm.

Having thus fully described my inven tion, what I claim as new anddesire to secure by Letters Patent is: I I

1. A bobbin windin mechanism for sewshaped end 7 of the detent fromengageing machines, comprising a supporting member, a spring pressedrocker arm pivoted to the supporting member having bobbin spindlebearings, a bobbin spindle journaled in the bearings having a frictionwheel adapted to engage the fly wheel of the machine, a pivoted detentengaging one of the bearings and holding the friction wheel in contactwith the fly wheel, and a cast off arm for the detent adapted to beengaged by the thread wound on the bobbin for releasing the detent fromthe bearing as the winding proceeds.

2. A bobbin winding mechanism for sewing machines comprising asupporting member, a spring pressed rocker arm pivoted to die bearings,one of which has a flattened detent engaging surface, a bobbin spindlejournaled in the bearingshaving a friction Wheel adapted to engage thefly Wheel of the machine, a pivoted detent engaging the flattenedsurface of the bearing and holding the friction Wheel in contact withthe fly Wheel,

and a cast off arm for the detent adapted to be engaged by the threadWound on the bobbin for releasing the detent from the fiat-"10 JAMESALEXANDER FLANAGAN: Signed in the presence of-- CHAS, H. RIoHEs, W. J.GILOHRIST.

Ontario, October 28th, 1919.

